diff --git a/lib/galaxy/managers/base.py b/lib/galaxy/managers/base.py
index cbeb236b11d8..3ac563cdafa7 100644
--- a/lib/galaxy/managers/base.py
+++ b/lib/galaxy/managers/base.py
@@ -299,14 +299,14 @@ def _apply_orm_limit_offset(self, query: Query, limit: Optional[int], offset: Op
         return query
 
     # .... query resolution
-    def one(self, **kwargs) -> Query:
+    def one(self, **kwargs) -> U:
         """
         Sends kwargs to build the query and returns one and only one model.
         """
         query = self.query(**kwargs)
         return self._one_with_recast_errors(query)
 
-    def _one_with_recast_errors(self, query: Query) -> Query:
+    def _one_with_recast_errors(self, query: Query) -> U:
         """
         Call sqlalchemy's one and recast errors to serializable errors if any.
 
@@ -323,7 +323,7 @@ def _one_with_recast_errors(self, query: Query) -> Query:
             raise exceptions.InconsistentDatabase(f"found more than one {self.model_class.__name__}")
 
     # NOTE: at this layer, all ids are expected to be decoded and in int form
-    def by_id(self, id: int) -> Query:
+    def by_id(self, id: int) -> U:
         """
         Gets a model by primary id.
         """
@@ -353,7 +353,7 @@ def list(self, filters=None, order_by=None, limit=None, offset=None, **kwargs):
         items = self._apply_fn_filters_gen(items, fn_filters)
         return list(self._apply_fn_limit_offset_gen(items, limit, offset))
 
-    def count(self, filters=None, **kwargs):
+    def count(self, filters=None, **kwargs) -> int:
         """
         Returns the number of objects matching the given filters.
 
@@ -403,7 +403,7 @@ def _split_filters(self, filters):
                 orm_filters.append(filter_.filter)
         return (orm_filters, fn_filters)
 
-    def _orm_list(self, query=None, **kwargs):
+    def _orm_list(self, query: Optional[Query] = None, **kwargs) -> List[U]:
         """
         Sends kwargs to build the query return all models found.
         """
@@ -494,13 +494,13 @@ def create(self, flush: bool = True, *args: Any, **kwargs: Any) -> U:
                 session.commit()
         return item
 
-    def copy(self, item, **kwargs):
+    def copy(self, item, **kwargs) -> U:
         """
         Clone or copy an item.
         """
         raise exceptions.NotImplemented("Abstract method")
 
-    def update(self, item, new_values, flush=True, **kwargs):
+    def update(self, item, new_values, flush=True, **kwargs) -> U:
         """
         Given a dictionary of new values, update `item` and return it.